Every person (and thing) contains all three doshas.
However, the proportion varies according to the individual and usually one or two doshas
predominate. Within each person the doshas are continually interacting with one another
and with the doshas in all of nature. This explains why people can have much in common but
also have an endless variety of individual differences in the way they behave and respond
to their environment. Ayurveda recognizes that different foods, tastes, colors, and sounds
affect the doshas in different ways. For example very hot and pungent spices aggravate
pitta; but cold, light foods such as salads calm it down. This ability to affect the
doshas is the underlying basis for Ayurvedic practices and therapies.

A balance among the tridosha is necessary for health.
Together, the tridosha governs all metabolic activities. When their actions in our mind-body constitution are
balanced, we experience psychological and physical wellness. When they are somewhat
unbalanced, we may feel uneasy. When they are more obviously unbalanced - when one or more
of the three dosha influences are excessive or deficient-discernible symptoms of sickness
can be observed and experienced.

Regardless of the percentages of vata, pitta, or
kapha influences, your basic constitution represents your psychological and physical
nature. When balance is maintained, health is at optimum.